Light emitting display device and driving method thereof

Abstract

A light emitting display device includes a display panel for displaying an image, a driver for driving the display panel, and a temperature detector connected to anodes of organic light emitting diodes included in at least two sub-pixels positioned in the display panel, wherein the temperature detector detects at least two voltage values from the at least two sub-pixels and calculates a temperature measurement value for measuring a temperature of the display panel based on a difference between the at least two voltage values.

What is claimed is: 
     
       1. A light emitting display device comprising:
 a display panel configured to display an image; 
 a driver configured to drive the display panel; and 
 a temperature detector connected to anodes of organic light emitting diodes included in at least two sub-pixels positioned in the display panel, 
 wherein the temperature detector configured to detect at least two voltage values from the at least two sub-pixels and calculate a temperature measurement value for measuring a temperature of the display panel based on a voltage difference between the at least two voltage values, 
 wherein the temperature detector includes: 
 a differential amplifier connected to the anodes of the organic light emitting diodes included in the at least two sub-pixels and outputting the voltage difference between the at least two voltage values; 
 an amplifier configured to amplify and output the voltage difference output from the differential amplifier, 
 a voltage reader configured to read the voltage difference at time to be measured from the output terminal of the amplifier, 
 an AD converter configured to convert the voltage difference output from the voltage reader into a digital voltage difference, and 
 a DA converter configured to convert the digital voltage difference output from the AD converter into an analog voltage difference, 
 wherein the temperature detector continuously circulates the voltage difference based on the voltage reader, the AD converter, and the DA converter in order to increase the accuracy of the temperature measurement. 
 
     
     
       2. The light emitting display device according to  claim 1 , wherein the organic light emitting diodes included in the at least two sub-pixels receive different currents to generate the voltage difference. 
     
     
       3. The light emitting display device according to  claim 1 , wherein the organic light emitting diodes included in the at least two sub-pixels receive amounts of currents that are alternately varied. 
     
     
       4. The light emitting display device according to  claim 1 , wherein the at least two sub-pixels are adjacently disposed in a display area of the display panel or adjacently disposed in a non-display area of the display panel. 
     
     
       5. The light emitting display device according to  claim 1 , further comprising a timing controller configured to control the driver,
 wherein the timing controller compensates for a data signal to be supplied to the display panel based on the temperature measurement value transmitted from the temperature detector. 
 
     
     
       6. The light emitting display device according to  claim 1 , wherein the voltage reader includes an input terminal connected to a output terminal of the amplifier and an output terminal connected to an input terminal of the AD converter, the AD converter includes the input terminal connected to the output terminal of the voltage reader and an output terminal connected to an input terminal of the DA converter, and the DA converter includes the input terminal connected to the output terminal of the AD converter and an output terminal connected to the input terminal of the voltage reader. 
     
     
       7. The light emitting display device according to  claim 1 , wherein the at least two sub-pixels are disposed at each corner of the non-display area of the display panel. 
     
     
       8. A method for driving the light emitting display device of  claim 1 , comprising:
 applying current to the organic light emitting diodes included in the at least two sub-pixels formed in the display panel; 
 detecting the at least two voltage values from the anodes of the organic light emitting diodes included in the at least two sub-pixels; 
 calculating the voltage difference between the at least two voltage values; 
 calculating the temperature measurement value for measuring the temperature of the display panel based on the voltage difference; and 
 compensating for a data signal to be supplied to the display panel based on the temperature measurement value. 
 
     
     
       9. The method according to  claim 8 , wherein the applying current to the organic light emitting diodes comprises applying different currents such that the voltage difference is generated between the organic light emitting diodes included in the at least two sub-pixels. 
     
     
       10. The method according to  claim 9 , wherein the organic light emitting diodes included in the at least two sub-pixels receive amounts of currents that are alternately varied.